Senior Backend Developer (PHP) – WordPress/WooCommerce

Winzons; India; On-site; INR 1,200,000 - 2,000,000; Full time

Job summary

Wisetr Technology in Delhi is seeking a Senior Backend Developer - PHP to lead WordPress and WooCommerce plugin development, architecture design, and product features. The role emphasizes ownership, problem solving, and producing production-ready code for a SaaS-like product ecosystem.

You will mentor engineers, collaborate with Product, and ensure robust performance, security, and compatibility across WordPress and WooCommerce. On-site work in Delhi is required.

Qualifications

• 5+ years of hands-on WordPress development
• Expert in PHP, OOP, design patterns and SOLID principles
• Experience with WordPress plugins and WooCommerce
• Strong knowledge of WordPress hooks (actions & filters)
• MySQL and performance optimization experience
• Git for version control and code reviews
• Security-focused development to prevent vulnerabilities
• Ability to lead and mentor engineers
• On-site in Delhi office

Responsibilities

• Lead WordPress plugin development and product feature development
• Own architecture decisions for complex features across multiple products
• Collaborate with Product team to convert requirements into high-quality code
• Build custom solutions based on real customer use cases
• Ensure all features are properly tested and documented before release
• Mentor mid-level and junior developers through code reviews and pairing
• Lead initiatives that improve developer productivity and code quality
• Think creatively about technical challenges and innovative solutions
• Drive technical standards and best practices for the team
• Develop custom solutions for WooCommerce stores using WordPress hooks
• Utilize deep knowledge of WordPress hooks to extend core functionality
• Monitor product behavior after updates and releases
• Debug complex cross-system issues and performance bottlenecks
• Ensure smooth upgrades and backward compatibility
• Perform root-cause analysis to prevent repeat issues
• Resolve plugin conflicts and compatibility issues
• Design scalable solutions across product ecosystem
• Collaborate with Product and Engineering teams to implement improvements
• Manage code using Git and maintain clean, scalable codebases
• Follow WordPress and WooCommerce best practices
• Conduct regular code reviews
• Utilize Cursor AI for code assistance and security checks
• Document technical decisions and create knowledge-sharing resources
• Create clear use cases for QA testing
• Work with QA to ensure features are thoroughly tested
• Reduce post-release bugs through pre-release validation
• Assist Customer Success engineers with technical guidance
• Handle L2 support tickets for FunnelKit Checkout, Cart, and Bump
• Debug WordPress, WooCommerce and plugin-related issues
• Coordinate with Customer Success for product improvements
• Develop and maintain CSS and templates for FunnelKit products
• Maintain high UI and performance standards

Skills

WordPress development

WooCommerce internals

WordPress hooks

PHP mastery

MySQL optimization

Git version control

Security best practices

Product-based plugins

Checkout flows

Code reviews

AI-assisted development

Education

Bachelor's degree in CS/IT

Tools

Cursor AI

Job description

Company Name: Wisetr Technology

Job Role: Senior Backend Developer - PHP

Experience Required: 5-8 Years

Employment Type: Full-Time

Work Mode: On-Site

Location: Delhi NCR, India

Salary: ₹12-20 LPA

Qualification: Bachelor's Degree in Computer Science, Information Technology, or related field (preferred)

Role Overview :

This role is ideal for someone who :

• Can lead the development of our WordPress & WooCommerce product suite as a senior engineer who thinks beyond code
• Enjoys solving real customer problems
• Has worked on production-level WordPress plugins or SaaS products
• Takes ownership of both development and troubleshooting

You will drive architectural decisions, mentor team members, and shape products that impact thousands of businesses. We're looking for someone who combines deep technical expertise with product thinkingunderstanding not just how to build features, but why they matter to customers.

Key Responsibilities :

1. Plugin Development & Product Feature Development :

• Build and maintain WordPress plugins to extend site functionality and improve user experience
• Own architecture decisions for complex features across multiple products
• Work with the Product team to convert requirements into high-quality code
• Build custom solutions based on real customer use cases
• Ensure all features are properly tested and documented before release
• Mentor mid-level and junior developers through code reviews and pairing
• Lead initiatives that improve developer productivity and code quality
• Think creatively about technical challengesfinding innovative solutions
• Drive technical standards and best practices for the team

2. WooCommerce Integration & WordPress Hooks :

• Develop custom solutions and features specifically for WooCommerce stores using WordPress hooks.
• Utilize deep knowledge of WordPress hooks (actions & filters) to extend core functionality and integrate with other plugins.

3. Troubleshooting & Release Stability :

• Monitor product behavior after updates and releases
• Debug complex cross-system issues and performance bottlenecks
• Ensure smooth upgrades and backward compatibility
• Perform root-cause analysis to prevent repeat issues
• Resolve issues related to plugin conflicts, performance, and compatibility with WordPress and WooCommerce.

4. Product Improvement & Analysis :

• Design scalable solutions that work across our product ecosystem
• Analyze L2 support tickets to identify patterns and gaps
• Collaborate with Product and Engineering teams to implement improvements and evaluate technical feasibility and trade-offs

5. Git & Code Management :

• Manage code using Git (commits, merges, releases)
• Maintain clean, scalable, and secure codebases
• Follow WordPress and WooCommerce best practices
• Conduct regular code reviews

6. AI-Assisted Development :

• Use Cursor AI for code assistance, security checks, and snippet creation
• Improve development speed while maintaining high code quality
• Work closely with the development team to ensure smooth integration of plugins with existing systems
• Document technical decisions and create knowledge-sharing resources

7. QA & Test Case Collaboration :

• Create clear use cases for QA testing
• Work closely with QA to ensure all features and fixes are thoroughly tested
• Reduce post-release bugs through strong pre-release validation

8. Internal Support to Customer Success :

• Assist Customer Success Engineers with technical guidance
• Help resolve complex L1 issues when required
• Ensure recurring problems are documented and addressed at the product level
• Handle and resolve L2 support tickets for FunnelKit Checkout, Cart, and Bump
• Debug complex WordPress, WooCommerce, and plugin-related issues
• Provide fast, stable, and scalable solutions
• Identify recurring issues and propose long-term product improvements
• Coordinate closely with Customer Success Engineers

9. CSS & Template Development :

• Develop and maintain CSS and templates for FunnelKit products
• Ensure responsive, cross-browser compatible designs
• Maintain high UI and performance standards

Required Skills & Experience :

• 5+ years of hands-on WordPress development
• Strong experience with :
• a. WordPress Core & Plugin Development
• b. WooCommerce internals and its ecosystem (APIs & customizations)
• c. WordPress hooks (actions, filters, and custom hooks)
• d. PHP mastery (expert-level OOP, design patterns and SOLID principles)
• e. Database proficiency - Advanced MySQL skills, query optimization, custom table design JavaScript, HTML, CSS
• Strong debugging and troubleshooting skills to resolve plugin related issues
• Security First - Expert in preventing SQL injection, XSS, CSRF; capability checks and input validation
• Experience working on product-based WordPress plugins or SaaS
• Strong understanding of orders, checkout flows, and extensibility points
• Proficient with Git version control and collaboration
• Performance Mindset : Experience optimizing slow queries, managing memory, and profiling
• Technical Leadership : Code review experience, mentoring ability, architecture decision-making
• Communication : Explains complex technical concepts clearly to different audiences
• Ability to work on-site from our Delhi office

Nice-to-Have Skills :

• Payment gateway integration and debugging experience
• Background processing and job scheduling (Action Scheduler or similar)
• REST API design and development
• Multi-currency or internationalization experience
• Subscription/recurring billing systems knowledge
• Contributing to or maintaining open-source projects
• Experience building WooCommerce extensions
• Experience with checkout, cart, or conversion-focused products
• Familiarity with performance optimization and security best practices
• Experience using AI tools for development
• Candidates with hands-on experience in Agentic AI systems and working with Claude Code will be given preference.

Why This Role is Exciting :

• Product Impact : Build features that directly impact revenue for thousands of businesses
• Cross-Product Thinking : Work across an ecosystem of products, not siloed features
• Innovation Encouraged : Find creative solutions to hard problemswe value ingenuity
• Real Leadership : Influence technical direction without organizational bureaucracy
• Modern Engineering : AI-enhanced workflows, continuous improvement, quality-first culture
• WordPress at Scale : Solve interesting challenges in one of the world's largest tech ecosystems

What Success Looks Like :

First 3 Months :

• Lead your first major feature from design to deployment
• Establish yourself as a reliable code reviewer
• Identify and fix a significant performance or architectural issue

First 6 Months :

• Own a product area and drive its technical direction
• Mentor team members with measurable improvement in their skills
• Ship an innovative solution that becomes a best practice

First Year :

• Drive cross-product improvements that benefit the entire ecosystem
• Be the technical leader others consult for complex decisions
• Contribute to hiring and growing the engineering team

What We Value :

• Product-minded engineering : Understanding business impact, not just technical elegance
• Ownership mentality : Taking responsibility for outcomes, not just tasks
• Continuous improvement : Always learning, always getting better
• Knowledge sharing : Writing docs, mentoring others, building team capability
• Creative problem-solving : Seeing opportunities others miss, finding better ways

What We Offer :

• Opportunity to work on globally used WordPress products
• Competitive senior-level compensation
• High-ownership, low-bureaucracy environment
• Collaborative, product-driven culture
• Competitive salary based on experience
• Long-term growth and learning opportunities
• Technical leadership growth opportunities

NOTE : This is a full-time, on-site position based in Delhi. Remote or hybrid candidates will not be considered.